This is one of a fairly large group of irregular -ir verbs that are all conjugated the same way. Other members of this group include sortir and dormir. The most significant difference between these verbs' conjugation and that of the regular -ir verbs is that these verbs' conjugation does not use the infix -iss-. Further, this conjugation has the forms (je, tu) pars and (il) part in the present indicative and imperative, whereas a regular -ir verb would have *partis and *partit (as in the past historic).

This verb conjugates as a third-group or second-group verb (ending in -ir, without or with an -iss- infix). Old French conjugation varies significantly by date and by region. The following conjugation should be treated as a guide.